Paper pulp and like beating engine



March 13, 1928. 1,662,466

s. MILNE PAPER PULP AND LIKE BEATING ENGINE Filed Nov. 3: 1,926 4 Sheets-Sheet 1 March 13, 1926. v 1,662,466

S. MILNE PAPER PULP AND LIKE BEATING ENGINE Filed Nov. 3, 1926 4 Sheets-Sheet 2 flu/Mn March 13, 1928.

' 1,652,466 S. MILNE PAPER PULP AND LIKE BEATING ENGINE Filed Nov. 5 4 Sheets-Sheet 3 Match 13, 1928.

S. MlLNE PAPER PULP AND LIKE BEATING ENGINE 4 Sheets-Sheet 4 Filed Nov. 5, 1.926

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Patented Mar. 13, 1928.

UNITED STATES PATENT OFFICE.

SAMUEL MILNE, OF EDINBURGH, SCOTLAND.

PAPER PULP AND LIKE BEA'I'ING ENGINE.

Application filed November 3, 1926, Serial No. 145,98i, and in Great Britain Iovember 88, 1825.

This invention relates to paper pulp and like beating engines.

The main feature of the invention is an improved arrangement and combination of bed-plate, backfall, beater roll supporting means, and beater cover. Other features are means for causing the pulp which is thown oil' by the ends of the roll to pass over the periphery of the roll, and means for preventing the pulp passing between the ends of the roll and the cover from the side next the backfall. A further feature is an improved shape of tank, and improved means for circulating and mixing the pulp in the tank, the whole of the im rovements combining to provide a highly e cient heating engine.

The invention will be fully described with the aid of the accompanying drawings, wherein Fig. 1 illustrates a longitudinal section of a pulp beating engine constructed according to the invention.

Fig. 2 illustrates a cross-section of the roll cover on line 0:, m of Fig. 1.

Fig. 3 illustrates a plan of Fig. 1.

Fig. 4 illustrates a longitudinal section of an. alternative construction of beater embodying the invention.

Fig. 5 illustrates a side elevation of roll balancing gear used with the improved beater.

Fig. 6 illustrates a side or face view of a detached detail part of Fig. 4.

Fig. 7 illustrates a plan (in part) of the heater and shows an improved form of tank.

a is the tank which may be made either to the shape (in plan) shown in Fig. 3, or to the shape (in plan) shown in Fig. 7. b 1s a midfeather dividing the tank longitudinally and c is the beater roll arranged between said midfeather and one side of the tank. (I is the bed late which lies in a recess d formed in t e floor of the trou h. Such bedplate extends from the vertical plane passing through the axis of the roll a to a point where the tangential portion of the backfall e commences, and extends through an arc of approximately 75. The backfall 6 lies close to the roll and extends to a height of about one half the radius of the roll above the axis of same, and the front face is formed in a straight line tangent to the roll and at anangle of about 15 to the vertical.

The roll a is supported in bearings carried by levers c which are adjustable through worm and worm wheel gearing c and are ada ted to move the roll bodily at an angle of a out 37 /ffrom the vertical. Upon the roll axis or trunnion is a pulley f by which and a. belt 7 it is driven from any suitable source of power. In Figs. 4 and 5, balance weights 9 are provided, which are adjustably carried on a screw 9 mounted on the pivoted arm h of a stand 2', and which, through the medium of the link In, long lever arm k regulating screw 7c, and worm gear 0, balance the roll and allow of the easy adjustment of the roll in relation to the bedplate.

With the roll a mounted as described it is adapted to move towards and away from the bed late in a, diagonal path, thus always a apting itself to the bedplate, and with the bedplate arranged to come up to the backfall, and the'backfall tangential to same and close to the beater roll, the pulp does not lose its velocity and can be discharged Immediately it passes clear of the bedplate.

To prevent the pulp contacting with the roll on the lower side furthest from the bedplate, the cover m on such side isextended down towards the floor of the tank, and forms a battle or guard plate on which meets the impact of the ulp as it flows towards the roll and thus m1nimizes the resistance to turning of the roll and/or reduces the power required to drive the roll. The floor of the trough where it meets the bedplate is stepped or curved downwards at n as shown, instead of being fiat and level with the bedplate, thereby allowing ample room for the pulp to flow to the roll at such point.

The cover m is shaped to enclose the roll a and may be mounted so as to be capable of adjustment towards and away from the roll. That part of the cover above and in connection with the backfall is made curved in shape so that the pulp striking it is defiected with the least ossible loss of energy and caused to fall eyond the top edge of the backfall where it cannot interfere with the pulp being dischar ed by the roll. This part of the cover is rought down to be quite close to the roll, and the point where it meets the roll may be level with or onl slightly higher than the top of the backfa l to ensure a suflicient arc of the circumference to effect the discharge of pulp from the roll.

To help to further break up and mix the pulp, one or more diagonally disposed angle strips 0 carried by a frame 11, see Fig. 6, may be secured within the cover m the pulp, as it passes over the backfall, being deflected to one side by the strips 0 and caused to mix more fully than if such strips were not provided.

In Fig. 1 the backfall is composed partly of the metal of the trough and partly of a wood bar e, which allows of the height of the backiall being readily varied by substituting bars of different depth. Said bar may be secured to the cover on and be removable. In Fig. 4, the backfall is wholly of metal.

To deflect the pulp over the working face of the roll as it is thrown radially outwards by the roll ends, the roll cover on is formed with angular corner f"ces m see Fig. 2. Such angular faces extend all round the cover, but they may only extend around the upper portion of the cover. By means of said angular faces pulp is prevented lodging in the angles or corners of the cover and all the pulp comes in for treatment by the roll.

In the angular spaces between the backfall, Fig. l, and the roll, and at points opposite the spaces between the roll ends and the sides of the trough, filling strips 9' are applied, which serve to prevent the pulp, after reaching the backfall, flowing back alongside the roll.

To rovide for the even circulation and agitation of the pulp. a slowly rotating paddle or agitator may be provided at one end of the trough. see Figs. 1 and 3. This pad dle or agitator is preferably composed of two wood blades 1', r and a circular metal part 8 from which the blades are rigidly suspended. The paddle or agitator is mounted on a vertical spindle u journaled in a fixed bearing a, and rotated by worm wheel '10, and worm :21, driven say through belt pulleys 7 and belt 2 from the roll shaft. The hearing 4! may be part of a metal casing o supported above the trough by a bracket 12'' and cross beams a.

As shown in Fig. 1. the blades swee close to the outer wall of the trough and c ose to the edge of the mid-feather b of the trough, and the effect on the pulp as the paddle rotates is to assist the movement of the pulp next the outer wall of the trough and to retard the flow of the pulp next the mid-feather. In this way the flow of the pulp is equalized and the pulp is also efi'ectually mixed.

The mixing paddle may not always be used, and in Fig. 4. it is shown omitted.

Instead of being made semi-circular in plan at each end. the trough may be made as shown in Fig. 7, the round or arched parts 6 being struck from a radius taken from the end of the mid-feather b and joined by a tangent or flat 1) extending at an angle to the side of the tank. This shape of tank prevents lodgment of the pulp in the otherwise curved parts and the slower circulation of the pulp at such parts.

What I claim is 1. A paper pulp or like beating engine comprising a tank, and a longitudinal midfeather in said tank, a heater roll between said mid-feather and one side of the tank, bearings for said roll, levers carrying said bearings, and worm and worm wheel mechanism for adjusting said levers, and re ulatable balance weights for said levers an roll, a backfall lying close to said roll and extending at a slight angle above the level of the roll axis, a bedplate for said roll extending towards the backfall through an arc of about and a cover closely fittin and covering in the roll and also covering in the backfall, that part of the cover fitting the roll having angled or slopin faces opposite the spaced between itselt and the roll ends and on the side next the backfall having filling strips, and on that side of the roll furthest from the backfall said cover extending down to a point near the floor of the tank, as set forth.

2. A paper pulp or like beating engine, comprising a tank, and a longitudinal midfeather, a. beater roll between said mid-feather and one side of the tank, bearings for said roll, levers carrying said bearings and worm and worm wheel mechanism for adjusting said levers, and regulatable balance weights for said levers and roll, a backfall lying close to said roll and extending at a slight angle above the level of the roll axis, a bedplate for said roll extending towards the backfall through an arc of about 75 and a cover closely fitting and covering in the roll and also covering in the backfall. that part of the cover fitting the backfall being arched or curved and having within it diagonally disposed angle strips for diverting and mixing the pulp as it passes over the backfall, and that part of the cover furthest from the backfall extending down to a point near the floor of the tank, as set forth.

3. A paper pulp. or like beating engine, comprising a tank, and a longitudinal midfeather in said tank. a heater roll between said mid-feather and one side of the tank bearings for said roll, levers carrying said bearings and worm and worm wheel mechanism for adjusting said levers, and regulatable balance weights for said levers and roll, a backfall lying close to said roll and extending at a slight angle above the level of the roll axis, a bedplate for said roll extending towards the backfall through an arc of about 7 5 and a cover closely fitting and covering in the roll and also covering in the baokfall, that part of the cover furthest from the backfall extending down in the form of a bafie plate to a point near to the tank floor, axis therefor opposite one end of the midand that part nearest said backfall extendin feather, means or rotatably supporting said down close to the periphery of the roll, an paddle and means for rotating the paddle, 10 then extending upwards and over the backas set orth.

I fall, such last named part being arched or In testimony whereof I have signed my curved to allow the pu p. to ass freely over name to this specification. the backfall, a rotary padrfie and vertical SAMUEL MILNE. 

